text: // 构建 “障碍类”
  function Block(img) {
      this.arr = [
          {row: 7, col: 8},
  		{row: 7, col: 9},
  		{row: 7, col: 10},
  		{row: 8, col: 10},
  		{row: 9, col: 10},
  		{row: 10, col: 10},
  		{row: 10, col: 11},
  		{row: 10, col: 11},
  		{row: 10, col: 12},
      ];
      this.img = img;
  }